Hello mingdao,
no, C29 is still less profitable… go see this post:
if you take RX VEGA, for instance (I use those), you have:
C29 - 2.85 GPS - 0.098 GRIN/DAY
C31 - 0.41 GPS - 0.120 GRIN/DAY
according to grin-pool.org
Take care,
PS - for C31 use MinerBabe’s KBMiner, for C29 i still go with Grin-Miner…